I think the 6 series coupe moved upclass to the Merc CL. Where do you suppose the E Class Coupe fits into your chart ?

Considering price. The new 6-series slots right between the E-class coupe and CL.

No question I would cross shop the E-coupe and 6-series. Don't really care what chassis either car is built on. The E-coupe offers every electronic and comfort gadget you would want. I personally think the E-coupe is sexy as hell. You can get into a twin-turbo V8 for much less than the 6-cylinder 6-series.